RadioShack Corp. will close as many as 1,100 stores—a fifth of its total— after a sharp drop in sales over the holidays left it with a loss of $400 million last year.

The deep cuts underscore the difficulty the retailer of electronic parts and gadgets has had adapting to modern trends in the business. While the closings will shrink RadioShack’s footprint, they leave a still-sprawling operation with 4,000 locations, including franchisees, and a challenging fix-it job ahead for Chief Executive Joe Magnacca.

RadioShack got plenty of attention on Sunday with a playfully self-critical Super Bowl ad showing cultural icons of the 1980s returning to clear out one of its stores that seemed to be stuck in their decade.

And now, faster than the Back to the Future-era DeLorean they sped away in, news that many of RadioShack’s stores won’t be getting a makeover — they’ll be meeting a fate even worse than a return to the eighties. Via the WSJ’s Emily Glazer:

RadioShack Corp. is planning to close around 500 stores in the coming months as the electronics retailer continues working with advisers to restructure the company, people familiar with the matter said Tuesday.

It is unclear which of RadioShack’s roughly 4,500 stores will be closed and when exactly the closings will begin, these people said, adding that it isn’t unusual for companies to close stores when going through operational restructurings.

In October, RadioShack secured $835 million in loans to refinance about $625 million of debt. Those funds, from a group led by GE Capital, also freed up cash for RadioShack’s overhaul.